Intake-manifold-heating device



H. H. HOLLOWAY.

INTAKE MANIFOLD HEATING DEVICE.

APPLICATION FILED FEB. 25. 1920.

1,394,830. Patented 00E 25, 1921-.

/NVE/VTUR H. H. HULLmx/AY UNITED STATES PATENT OFFICE.

INTAKE-MANIFOLD-HEATING DEVICE.

Application led February 25, 19.20.

, T alt @07mm t may concern.

Vvented new and Be it known that I, HALBERT H. HOLLO- WAY, a citizen ofthe Unit-ed States, residing at San Francisco, in the county of SanFrancisco and State of California, have inuseful Improvements inIntake-ManifoldHeating Devices, of which the following is aspecification.

This invention relates to a simply constructed, inexpensive device forconducting heat from the exhaust manifold of an internal combustionengine to the intake manifold in such a manner that fuel passing throughthe manifold will be quickly and effectively heated to the end that athorough combustion of the fuel and a more eiiicient engine operationare provided.

. An object of the invention is to provide a heating device of thecharacter described which is constructed so that it may be quickly andeasily installed' for operation and so that the heat is distributed tosuch portions of the manifold as will most readily and effectively heatthe fuel passing therethrough to the engine.

The invention possesses other advantages and features, some of whichwith the foregoing will be set forth at length in the followingdescription where I shall outline in full that form of the inventionwhich I have selected for illustration in the drawings accompanying andforming a part of the present specification. In said drawings, I haveshown one form of the construction of my invention but it is to beunderstood that I do not limit myself to such form, since the inventionas expressed in the claims may be embodied in a plurality of forms.

vFigure I is a fragmentary side elevation of an internal combustionengine showing the relative positions of the intake and exhaustmanifolds and the heating device of my invention. y ,Y

Fig. 2 is a vertical sectional view taken on the line 2*2 of Fig. l. Y

Fig. 3 is a top plan view looking down upon the inside of a modifiedform of the invention in which the heating element is separate from theintake manifold.

Fig. 4 is a vertical Sectional view takenon theline 4-4 of Fig. 3.

Fig. 5 is a fragmentary cross sectional view of a modified form'of theinvention.

Referring'particularlyto the drawings, l designates the exhaust manifoldand 2 the intake manifold of a well known type of Specification ofLetters Patent.

Patented Got. 25, 1921. Serial No. 361,236.

automobile engine and 3 the device of my invention.

My invention contemplates the provision of a novel conductor forconducting heat from the exhaust manifold to the intake manifold. Thisconductor is constructed so that the heat will be readily conducted tosuch portions of the intake manifold that the fuel in passing throughsaid manifold will be quickly and effectively heated. One simple,effective, and inexpensive way in which I carry out the invention asillustrated in Figs. l and 2 is to provide the heating device as anintegral part of the intake manifold. It is obvious that I may make thisheating device integral with the exhaust manifold instead of the intakemanifold, but I prefer the latter construction,` and, as shown, theintake manifold is provided with an integral preferably substantiallyrectangular upright extension which comprises a solid metal body 4disposed intermediate of the ends of the manifold and extending from theupper side thereof. This body 4 may be formed when the intake'manifoldis cast. The inner face of the body 4 adjacent to the outer side thereofis curved as at 5, to conform to the surface contour of the exhaustmanifold and closely engage said manifold, as shown in Fig. 2 of thedrawings. The upper end of the body is curved inwardly, as at 6, towardthe engine and lies upon the upper side of the exhaust manifold so thatapproximately one half of the surface of said manifold is contacted withby the body 4f. The body is thickened from a point approximately centralof its ends to the lower end thereof and this thickened portion 7extends in between the intake and exhaust manifolds. The exhaustmanifold is provided with depending spaced ears 8 and these ears areusually bolted to the engine so as to secure the manifold in place.Formed in the thickened portion 7 of the body and spaced from oneanother are upwardly opening pockets or recesses 9 which receive theears 8 and are curved and shaped so as to conform to, and engage, saidears.

Thus the heat from the ears 8 is readily transmitted to the upper sideof the intake manifold through the lower end of the thickened portion ofthe body I and at points opposite where the lower ends of the ears 8engage in said body, there are provided relatively hot spots in themanifold. Thus fuel passing upwardly through the mani-

